Julie Defoe, a 51-year-old who works for a startup, said she feels backed into a corner by the nominees

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In this Oct. 16, 2010, file photo, President Barack Obama speaks in Boston. After electing Obama in 2008 on a promise of hope and change, many Americans feel quite the opposite.

Eight years ago, Barbara Conley was one of the millions of Americans swept up in Barack Obama's promises of hope and change when he accepted the Democratic nomination at a packed football stadium a few miles from her home in the Denver suburbs.

With Donald Trump and Hillary Clinton preparing for their own nominating conventions, the 68-year-old independent is filled with so much frustration at the candidates and the political system that propelled them to victory that she can't even imagine voting in November.

"I'm so mad about both of the candidates," said Conley, who finds Clinton too dishonest and Trump too unproven to be president. She paused while loading groceries into her car and declared, "It's depressing."

Obama Stumps For Clinton in North Carolina

President Obama joined Hillary Clinton for a North Carolina campaign rally on July 5, 2016. On the Republican side, speculation continued to grow over Donald Trump's running mate pick. (Published Tuesday, July 5, 2016)

Less than four months before Election Day, that same sense of anger and anxiety runs deep with voters across the country. Trump and Clinton will each try to paint a rosy picture of life under their leadership during their back-to-back conventions, but it seems unlikely either can quickly shake Americans out of their bad mood.

A stunning 79 percent of Americans now believe the country is heading in the wrong direction, a 15-point spike in the past year, according to an Associated Press-GfK poll. Voters are strikingly unhappy with the candidates who will be on the ballot this fall, with only 22 percent saying they would be proud to see Trump win and 27 percent to see Clinton.

Julie Defoe, a 51-year-old who works for a startup, said she feels backed into a corner by the nominees. A self-described conservative Democrat who voted for Republicans in the past two presidential elections, Defoe has considered simply not voting in November.

"Or can we rally for a box that says, can we get a do-over?" said Defoe, who lives in Lafayette, Colorado.

By some measures, America's palpable pessimism can appear at odds with the country's economic and security standing.

The economy is growing, jobs are being created and unemployment is low. Tens of thousands of American troops have come home from dangerous war zones during Obama's presidency. Crime is down nationwide.

Raw Video: Obama Responds to Nice Attacks

President Obama made remarks on the attack in Nice, France during a news conference at the White House on Friday, July 15, 2016. (Published Friday, July 15, 2016)

But the improving economy is no doubt a changing one, leaving some Americans without the skills they need for the jobs available. Terrorism fears have been heightened in the U.S. after a string of deadly incidents in the West, including Thursday night's attack in Nice, France, that killed more than 80 people during a Bastille Day celebration.

This summer in particular has seemed to bring a steady stream of gruesome news.

A mass shooting at an Orlando nightclub left 49 people dead, as well as a gunman who pledged his allegiance to the Islamic State group despite no formal ties to the group. Shootings by police of black men in Louisiana and Minnesota were captured on video, followed by the murder of five police officers in Dallas, and another three Sunday in a shooting rampage in Baton Rouge, Louisiana.

The incidents seemed to momentarily spark national soul searching about gun violence and race relations. But as Americans looked toward the presidential candidates and other political leaders, some saw little sign of readiness to meet a challenging time.

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President Obama capped off his Fourth of July celebrations by serenading his eldest daughter Malia. (Published Tuesday, July 5, 2016)

"I wish the candidates would get together and be a team to help each other and help the country, that's what I wish," said Lonila Duarte, a 71-year-old from Denver who plans to vote for Trump. "And stop acting like children."

Emilie Passow, a 68-year-old Democrat from Bala Cynwyd, Pennsylvania, said her disgust extends beyond the presidential candidates to Congress as well. "There's so little attempt at conciliation and consensus," she said.

More than any other candidate in this election, Trump has latched onto the public's fears. He promises to "Make America Great Again," pledging to bring back manufacturing and mining jobs from areas where they've disappeared. With coded — and sometimes not so coded — language, he's cast aspersions on immigrants seeking to come to the United States and on Muslims already here.

"We're trying to be so nice, we're trying to be so civil. We're so weak," Trump said hours after the Nice attack. "The world has got to strengthen up, and we have to be very tight with our borders. It's now a different world."

While Trump supporters cheer those lines, they leave other voters on edge.

"It's humiliating as an American that we would actually entertain that, that there are people who actually support him," said Melissa Andreas, a 42-year-old dance instructor from Erie, Colorado. "I'm shocked."

Indeed, three-quarters of Americans consider Trump to be only slightly or not at all civil, and half say he's at least somewhat racist, according to the AP-GfK poll.

But three-quarters consider Clinton to be only slightly or not at all honest, and most think her use of a private email address and server while she was secretary of state broke the law, including 4 in 10 who think she did so intentionally.

Andreas has never voted before in a presidential election. She liked Obama, but felt his Republican rivals John McCain and Mitt Romney were palatable enough that she didn't see a need to cast a ballot in her swing state.

"This election actually has me chiming in," said Andreas, who plans to vote for Clinton. She said of the prospect of a Trump presidency: "I'm scared that our country is going to be in utter turmoil with him as our leader."

Seventy-six-year-old Mike Ryan shares many of those sentiments about Trump. But his view of Clinton isn't much better.

"I've always been a Democrat and always will be," Ryan said. "But it's going to be a toughy."

Like his fellow Coloradan Barbara Conley, some of Ryan's feelings stem in part from his frustrations with Obama's eight years in office. Though Ryan supports Obama, he's been irritated by the years of battle between the Democratic president and Republican lawmakers that have often ended in stalemate.